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Merge pull request #4 from kkonradpl/main

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Add support for legacy RDS message
This commit is contained in:
Marek Farkaš
2024-01-22 23:08:55 +01:00
committed by GitHub
parent 8d18c238b5 451bdcc982
commit 2a7ff7797a
1 changed files with 27 additions and 17 deletions
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44
datahandler.js
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@@ -6,8 +6,6 @@ const win32 = (os.platform() == "win32");
const unicode_type = (win32 ? 'int16_t' : 'int32_t');
const lib = koffi.load(path.join(__dirname, "librdsparser." + (win32 ? "dll" : "so")));
var rdsBuffer = [];
koffi.proto('void callback_pi(void *rds, void *user_data)');
koffi.proto('void callback_pty(void *rds, void *user_data)');
koffi.proto('void callback_tp(void *rds, void *user_data)');
@@ -200,16 +198,10 @@ var dataToSend = {
country_iso: 'UN',
users: '',
};
var legacyRdsPiBuffer = null;
const initialData = { ...dataToSend };
const resetToDefault = dataToSend => Object.assign(dataToSend, initialData);
function handleBuffer() {
for (let group of rdsBuffer)
{
rdsparser.parse_string(rds, group);
}
}
function handleData(ws, receivedData) {
// Retrieve the last update time for this client
let lastUpdateTime = clientUpdateIntervals.get(ws) || 0;
@@ -221,12 +213,12 @@ function handleData(ws, receivedData) {
switch (true) {
case receivedLine.startsWith('P'):
modifiedData = receivedLine.slice(1);
legacyRdsPiBuffer = modifiedData;
if (dataToSend.pi.length >= modifiedData.length || dataToSend.pi == '?') {
dataToSend.pi = modifiedData;
}
break;
case receivedLine.startsWith('T'):
rdsBuffer = [];
resetToDefault(dataToSend);
dataToSend.af.length = 0;
rdsparser.clear(rds);
@@ -261,15 +253,33 @@ function handleData(ws, receivedData) {
case receivedLine.startsWith('R'):
modifiedData = receivedLine.slice(1);
if (rdsBuffer.length > 1000) {
rdsBuffer.shift();
if (modifiedData.length == 14) {
// Handle legacy RDS message
var errorsNew = 0;
var pi;
if (legacyRdsPiBuffer !== null &&
legacyRdsPiBuffer.length >= 4) {
pi = legacyRdsPiBuffer.slice(0, 4);
// PI message does not carry explicit information about
// error correction, but this is a good substitute.
errorsNew = (legacyRdsPiBuffer.length - 4) << 6;
} else {
pi = '0000';
errorsNew = (0x03 << 6);
}
let errorsOld = parseInt(modifiedData.slice(12), 16);
errorsNew |= (errorsOld & 0x03) << 4;
errorsNew |= (errorsOld & 0x0C);
errorsNew |= (errorsOld & 0x30) >> 4;
modifiedData = pi + modifiedData.slice(0, 12);
modifiedData += errorsNew.toString(16).padStart(2, '0');
}
rdsBuffer.push(modifiedData);
if (rdsBuffer.length > 1) {
handleBuffer();
}
rdsparser.parse_string(rds, modifiedData);
legacyRdsPiBuffer = null;
break;
}
}